Telephone-relay.



No. 847,656. PATENTED MAR. 19, 1907.

D. s. DIGKERT.

TELEPHONE RELAY.- APPLICATION FILED MAY 22, 1906.

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DILPERT s. DICKERT, or SALT LAKE CITY, UTAH.

TELEPHQNEQELAY.

Specification of Letters Patent.

-Patented March 19, 1907.

Application filed May 22,1906. Serial No. 318,152.

1'0 all whont it -may concern: 1

Be it known thatI, DILPERT S. DICKERT, a citizen of. the United States,and a resident of Salt Lake City, in thecountyof Salt Lake and State ofUtah, have invented certain new and'useful Improvements in TelephoneRelays, of which the following is a specification.

My invention relates .to relays for telephone-circuits; and it has forits object a telephonerelay which when inserted into thetelephone-circuit will enable soundwaves to be transmitted much greaterdistances than is at relay.

For this purpose my invention conslsts, es-

present possible without a sentially, of-a telephone-relay comprising.

two sets of magnets, a diaphragm controlled by said magnets, and meansin connection with ,said diaphragm to transmit and strengthen weakincoming vibrations.

The nature of my invention will best be understood in connection withthe accompanying drawing, which is a diagrammatic -'view showing myrelay connected in circuit betweentwo stations. g

Referring to the drawing, A and B indicate two telephone-stations, forexample, sixteen himdred'iniles apart and each eight hundred miles fromthe transmitting-relay R, eight hundred miles being about the presentlimit of direct transmission.

represents the usual telephone-receiver, and 11 the transmitter.

12 is a local battery located either at the instrument or at a centralstation.

13 and 14 are the line-wires from station A, and 15 and 16 theline-wires from station B.

The relay-transmitter R comprises the two setsof receiving-magnets 17and 18, one for each station, a common diaphragm 19, placed between saidmagnets, transmitters 20 and 2] and the induction-coils 22 and 23, andbatteries 2e-and 25.

The line-wires 13-, 14, 15, and 16 terminate, I

respectively, in the primary coils ofthe induction-coils 22 and 23,whose secondary coils are in a closed circuit including, respec tively,the magnets 17 and 18. The relaybattery 24 is located in series in oneof the liue-wires from station A and the relay-battery 25in one of thelinewires from station B. The transmitting devices 20 and 21 arepreferably of the carbon type with contactpoint operatediby thediaphragm 19. The transmitter 20 is connected by wire With line-wire 16,and the contact-rod 26, insulated from the diaphragm 19, is electricallyconnected by wire 31'with the line-wire 15.

The transmitter 21 is connected to the line wire 14'by wire 28, and thecontact-rod 27 is electrically connected with the diaphragm itself,which is in connection with line-wire 13 through wire 29.

The operation and circuits of my improved relay-transmitter. are asfollows: A weak telephonic impulse on the line 13 14 enters the relayand completes the circuit through the primary oi induction-coil 22. Acurrent is thus set up in the secondary of this coil, therebyenergizing'the magnets 17, which in turn move the diaphragm 19. Thempvement of the diaphragm .19 varies the resistance of the transmitter20 through varying the degree 01" contact, and thereby varies the phonicimpulses, but considerably strength- I ening them through the localbattery 25. l A telephonic impulse coming iromthe station B operatessimilarly by energizing the magnets 18 and operating the transmitter 21,which sends a corresponding strengthened impulse to the line-wires 13 14through local battery 24. p

In providing a common diaphragm between the two sets of magnets I avoidthe obj ectionable eflect of repeating back into the sendingline,causing a consequent confusion of vibrations. flt might be supposed thatthe pulsations from one transmitter would affect the opposite primaryand secondary, and thereby the corresponding magnets, and thus cause arepeating back into the sending-line. This dcesno't occur, however; asthe primar coil becomes partly short-circuited by the'transmitter-circuit, thus weakening the magnets and releasing thediaphragm, and thereby contact resistance of the transmitter. Also sinceboth contact-rods are. attached to a I common diaphragm, as the one isdrawn toward its carbon block the other is drawn away, tending toincrease the resistance of :05

the transmitter-circuit. The one transmitter in operating thusautomatically increases the contact resistance of the other by means ofthe common controlling-diaphragm and the part short-circuiting of theopposite primary. 1 1 o "What I claim as new, and desire to secure byLetters Iatent of the United States, is.

1. In. a relay for telephor.c-liiies,- two magnetically-operatedtransmitting devices respectively shunted across the incoming andoutgoing lines, and means to increase the contact resistance'of one ofsaid transmitting devices when the other is in operation.

2. In a; relay for telephone-lines, two magnetically-operatedtransmitting devices re' spectively shunted across the incoming andoutgoing lines, and means to automatically lncrease the contactresistance of one of said transmitting devices when the other is inoperation.

3. In a relay for telephone-lines, two magnetically-operatedtransmitting devices respectively shunted. across the incoming and saidtransmitting devices when the other is outgoing lines, and a commondiaphragm operatively connected therewith and adapted to lncrease thecontact resistance of one of electromagnetic means included in closedcircuits with the corresponding secondaries of said induction-coils; anda common diaphragm operated by said electromagnetic means andcontrolling said transmitting devices.

6. A relay adapted to be inserted in a telephone-line, and comprisingtwo inductioncoils whose prim arics are respectively in series with theincoming and outgoing lines; two electromagnets, included in closedcircuits with the corresponding secondaries of said induction-coils; acommon diaphragm interposed between said electromagnets; and twotransmitting devices controlled by said diaphragm and operated throughsaid magnets.

7. A relay adapted to be inserted in a tele-' phone-line, and comprisingtwo inductioncoils Whose primaries are respcetively in series with theincoming and outgoing lines; two electromagnets included in closed circuits with thecorresponding secondaries of said induction-coils; acommon diaphragm interposed between said electromagnets; atransmitter-circuit shunted across said outgoing line; a];transmitter-circuit shunted across said incomin "line; a source of electricity in series wit i' said outgoing line; a source of electricity inseries with. said incoming line; a trai'ismitting device in saidtransmitter-circuit shunted across the outgoing line a trait smittin gdevice in said transmittercircuit shunted across said incoming line,

said transmitting devices being controlled by said diaphragm andoperated through said electroinagiiets.

Signed at Salt Lake City, in theco'uiity of Salt Lake and State of Utah,this 3d day of May, A. D. 1906.

1.) l I ll ERT S; DICKER'I.

' litnesscs:

AiiiAL' l3. SiUVYER, J12; Eni'rii M. .llOLMAN.

